Heroku WebSocket(socket.io)'空闲连接'H15 - Node.JS

Question

我不知道如何摆脱Idle connection错误.它曾经更糟糕,但它仍然每小时左右发生一次.这是Papertrail得到的日志:

Aug 09 23:07:25 heroku/router: at=info method=GET path="/a/login/" host=... request_id=f99431f8-9ce9-4e1e-b16f-0ae2b50870ab fwd="74.210.150.28" dyno=web.1 connect=1ms service=258ms status=304 bytes=305  
Aug 09 23:07:26 heroku/router: at=info method=GET path="/js/auth.js" host=app.sofiatutors.com request_id=12896c98-9803-4161-bf5b-06028123ff86 fwd="74.210.150.28" dyno=web.1 connect=2ms service=3ms status=304 bytes=240  
Aug 09 23:07:56 heroku/router: at=info method=POST path="/api/email/reset/qEUsZwkRvp750OBgCFuXImiCWPhQbTD0vFVaGEyCZJJXEJGpm6Gi7cgKWsLqHOTusRHieWyVgEbqe6T5qH7wCJT9ROToeHnINhTDvq5unWT6r7fwh4ha59PlQVwB6TmS" host=app.sofiatutors.com request_id=ae44cd3d-cb06-42bd-8948-9e8ca8273ebe fwd="74.210.150.28" dyno=web.1 connect=1ms service=395ms status=200 bytes=426  
Aug 09 23:08:11 heroku/router: at=info method=POST path="/api/email/reset/qEUsZwkRvp750OBgCFuXImiCWPhQbTD0vFVaGEyCZJJXEJGpm6Gi7cgKWsLqHOTusRHieWyVgEbqe6T5qH7wCJT9ROToeHnINhTDvq5unWT6r7fwh4ha59PlQVwB6TmS" host=app.sofiatutors.com request_id=a0ed9edc-a561-4518-a61c-3d22fa9445aa fwd="74.210.150.28" dyno=web.1 connect=0ms service=214ms status=200 bytes=426  
Aug 09 23:08:21 heroku/router: at=error code=H15 desc="Idle connection" method=GET path="/socket.io/?EIO=3&transport=websocket" host=app.sofiatutors.com request_id=a5db86f2-7561-44db-bc1d-22ae69ac3a30 fwd="74.210.150.28" dyno=web.1 connect=1ms service=56301ms status=503 bytes=279 

一开始,我认为这是因为用户上传了一个文件或类似的东西但事实并非如此.从我看到的,用户只是重置他的密码.甚至更奇怪的是,除了乒乓球之外,此时不使用WebSocket!

我没有在网上找到任何解决方案.我正在为我的DNS使用CNAME记录.我通过发送ping到我的服务器保持连接活动,pong每20秒用我的WebSocket 回答.我在Socket.io中强制连接到WebSocket(我通过XHR轮询获得了更多的空闲连接).

这是我的客户端代码:

const socket_url = environment.indexOf('dev') === -1 ? "wss://" + window.location.host :  'ws://localhost:3000';

var socket = io.connect(socket_url, { transports : ["websocket"] });
let socketIoMiddleware = createSocketIoMiddleware(socket, "server/");

socket.on('connect', function() {
  console.log("L'utilisateur s'est connecté à un Socket.");
  // Init code
});

socket.on('disconnect', function(){
  console.log("Déconnexion au socket.")
});

socket.emit('ping');

socket.on('pong', function() {

  console.log("pong", new Date().toString());

  var to = setTimeout(function(){

    console.log("ping", new Date().toString());
    socket.emit('ping');
    clearTimeout(to)

  },20000);

});

和我的服务器代码(Node.JS with Express):

io.sockets.on('connection', function (socket) {
    socket.on('join-auth', function (data) {

      socket.join(data.session); // We are using room of socket io
      var room = data.session;

      socket.on('ping', function(){
        // console.log("ping pong", new Date().toString())
        io.sockets.in(room).emit('pong');
      })

      // The rest of my socket 

我知道Heroku对WebSockets有超时55秒,但我根本不明白为什么连接空闲或如何修复它.有没有人有想法？